摘要:
以含钒17.86 g/L,铬15.96 g/L的钒铬溶液为研究对象,采用水解沉钒法提取溶液中钒,考察了pH值、温度、时间、溶液中铬浓度、钠浓度对沉钒率的影响。研究结果表明:沉淀pH值1.8,沉钒温度95℃以上,反应60 min的水解沉钒率可达91.61%;溶液中铬浓度在1.7~17 g/L范围,随铬浓度增加沉钒率提高,铬浓度17 g/L时,沉钒率可达97.5%;溶液中铬浓度>17 g/L后,沉钒率开始降低,增加到25 g/L时,沉钒率急剧下降至95%;在考察35.2 g/L≤[Na]≤90 g/L范围内,水解沉钒率随溶液中钠浓度增加而明显降低。适量的铬有利于水解沉钒,而钠却明显降低沉钒率。
Abstract:
With the solution containing 17.86 g/L of vanadium and 15.96 g/L of chromium as the raw material,vanadium precipitation through hydrolysis was carried out in this work.The effects of pH value,temperature,time,chromium and sodium concentrations in the solution on the vanadium precipitation rate were investigated.The results show that a vanadium precipitation rate of 91.61% can be obtained at the pH value of 1.8 and the temperature above 95 ℃ for 60 min.At 1.7～17 g/L of chromium concentration in the solution,the precipitation rate of vanadium increases with increase of the chromium concentration,and 97.5% of vanadium precipitation rate can be achieved at 17 g/L of chromium concentration.However,the vanadium precipitation rate decreases with the chromium concentration exceeding 17 g/L,with the precipitation rate decreased to 95% at 25 g/L of chromium concentration.Furthermore,the rate of vanadium precipitation decreases obviously with increase of the sodium concentration（35.2～90 g/L） in the solution.Hence chromium with a proper concentration in the solution is favor for vanadium precipitation via hydrolysis,while sodium in the solution is adverse to vanadium precipitation.
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